I've seen some amazing renders of both Indigo and Luxrender (the main 
developer of Lux was an Indigo developer, or so I heard) with 
rendertimes ranging from 10 to 20 hours.  Both interiors and exteriors. 
  Of course, the specs of such machines are well above the current 
desktop standard -- I'm guessing they run in quad-cores from specialized 
architectural firms and the like.

Of course pov-ray and other renderers employing finite-step approaches 
to GI -- radiosity and photon mapping -- also render much faster in such 
machines.

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